Viljo Revell’s Toronto City Hall and Nathan Phillips Square (1965) is a well-loved Modernist icon. Completed after his death, the heritage-designated square was true to the spatial arrangement Revell had envisioned; over time, however, it had become run-down and dysfunctional. In 2006, the City of Toronto launched an international competition to redesign NPS. The winning design strategically rethinks the Square to transform it into an exemplary 21st-Century public space, drawing inspiration from Revell’s own references to classical Athenian political spaces. Through the redesign or relocation of existing elements and a new series of buildings and gardens framing the open plaza, the NPS Revitalization enhances the functionality, versatility, and appeal of Toronto’s signature civic space while augmenting this monumental heritage site’s “connectedness” to its surroundings.

Revell’s elevated walkways frame the Square and focus views towards the council chamber – as in the Athenian agora, the threshold of a porch (stoa) at the perimeter clearly defined the interior void. This definition was never fully developed, however, in NPS as built. To strengthen the coherence of the Square, the design team executed four tactical moves:

1. Open the Square – remove clutter at the centre to accommodate all kinds of large cultural gatherings
2. Create programmed, porous, landscaped “green rooms” around the perimeter to frame the square
3. Create new activated connections between the raised walkway and the Square
4. Strengthen links between levels and between zones using new architecture as the bridge to connect the two levels of the square

Major architectural components include the redesigned Skate Pavilion and creation of a permanent Stage with back-of-house suspended below in the parking garage. All new structures are multi-purpose and connect to the walkways. The glass-canopied, terraced form of the theatre provides covered public space and casual seating when not in use for performances, and its stairs connect the raised walkway to the Square. Small events can take place with performers facing westward toward stairs that double as bleacher seating; for larger events, those on the stage face eastward to overlook the entire Square.

A Peace Garden added in 1983 near the centre of the Square had compromised the space’s openness and ability to accommodate crowds – relocating it to the western edge freed up the Square’s centre for larger events. The terraced seating of the new Peace Garden is a major structure that conceals the underground parking garage’s exhaust duct while muffling its sound and redirecting the airflow. Other elements include a playground redesign, a new Sculpture Garden, a new forecourt along Queen Street, and a future two-storey restaurant. Although not yet completed, the master plan includes refurbishing the existing elevated walkways with gardens and seating.

Prior to the revitalization, City Hall’s podium was a grim, paved void: it is now Toronto’s largest publicly accessible green roof, a popular urban retreat for sitting and strolling. The Podium Roof Garden’s plantings, which change seasonally from bright yellows and oranges in the southwest to deep reds and purples in the northeast, were chosen to thrive in the site’s challenging shade and wind conditions.